Sewing machine



April 12, 1938. H. wElssMANN 2,113,969 v SEWING MACHINE 2 Shets-Sheet 1Filed May 27, 1957 BY HENRY` Wel'ssMaNN A TT ORNE Y April 12, 1938. H.wlalssMANN l 2,113,969

' SEWING MACHINE Filed May 27, 3.93"? 2 Sheets-Shea# 2 [NVENTOR 'BYHENRY WesssnNN l W WAATTORNEY Patented Apr. 12, 1938 Henry Weiss-mannIslan Stapleton, Staten Application May 27, 1937, Serial No. 145,014

4 claims.

This invention relates to new and useful improvements in the bobbinmechanism of a sewing machine. s

'I'he invention has for an object the construc- 5 tion of a bobbinmechanism which is characterized by a'bobbin container for the thread,an annular gear around said container and rotatively supported at itsedges for supporting'the container, and a novel arrangement forpermitting the top thread loop passing around the bobbin to interengagewith the bobbin thread.`

Another object of the invention is the construction of a device asmentioned which is simple and durable and which may be manufactured andsold at a reasonable cost.

For further comprehension of the invention, and of the objects andadvantages thereof,l reference will be had to the following descriptionand accompanying drawings,'and to the appended claims in which thevarious novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure-Fig. 1 is a side elevational view of a machine constructed according tothis invention.

Fig.` 2 is a fragmentary enlarged elevational view looking in thedirection of the line 2-2 of Fig. 1.

Fig. `3 is a sectional view .taken on the line 3-3 of Fig. 2.

Fig. 4 is a side elevational view of the bobbin container per se, withthe thread loop schematically applied.

Fig. 4a is a fragmentary horizontal sectional view taken on the line 4aof Fig. 4.

Fig` 5 is a sectional view taken on the line 5 5. of Fig. 2.

Fig.`6 is a sectional view of a bobbin container constructed accordingto another form of the invention.

Fig. 7 is atransverse sectional view similar to Fig. 3 but illustratinganother formof the invention, a simpliiied form.

VIn Fig. 1 a standard sewing machine III is illustrated having thecustomary cast base plate Ia, the wheel drive I 0b, the needle bar I 0c,and the pressure foot IUd. The details of this sewing machine will notbe given in this specication since they form no part of the invention.

The invention resides in the provision of a bobbin container II formedwith a passage IIa for the thread. An annular gear I2 is mounted around`the container and has the root I2a between a pair of' adjacent gearteeth cut deep (see Figs. 2 and 4a.). Top-thread loop catching hooks I3and Il are mounted on the container II at the sides of the gear I2 toguide the loop of thread I4' into the cut I2a of the gear I2 (see Fig.4).- Three rotatively supported pinions Ia, I5b and I5c have flanges I5en- 5 gaging the sides'of the gear for rotatively supporting the same.'I'hese flanges are formed with peripheral cuts I5' synchronized toalign with the cut I2a in the gear I2 to pass said thread loop duringthe rotation of the gears.

The bobbin container Il comprises a base portion IIb having a centralprojection IIc on which a bobbin Ild is rotatively supported. A coverIIe engages over the top of the base portion and is removably supportedin position by a peg II f engaging into an opening in the projectionIIc. The space IIa occurs between the peripheral edges of the body IIband the cover IIe. The cover may be removed to replace the bobbin.

The annular gear I2 is attached to the top portion of the container bodyIIb. The thread catching hook I3 is soldered or brazed to the top faceof the gear I2. The thread catching hook I4 is disposed immediatelybelow and is formed by a projecting end of a strip I la. which issoldered or brazed upon the container and extends in a helical band andconstitutes a cam for the purpose hereinafter described.

The pinion gear I5a is rotatively supported in a bracket I1 which isattached to the underside of the base Illa. The pinion I 5b is supportedon a bracket I8 similarly supported. The pinion I5c is supported on abracket I9, also similarly supported. One of `the pinion gears, thepinion gear |511, is driven and synchronized with the sewing machine.This pinion gear is mounted on a shaft 20 which is`provided with a bevelgear 2I meshing with a gear 22 on a rotatively supported shaft 23connected by gears 24 with a shaft 25 extending upwards into the body ofthe sewing machined and connected Withsome rotating part thereof. Thedetails' of this connectionare not shown on the drawings as they form nopart of the invention. The connection should be such that -the bobbincontainer II is caused to rotate two complete revolutions for each cycleof the needle bar IIJc.

Certain mechanism is provided for assisting the top thread loop I4' toengage around the bobbin container II. This mechanism includes the camstrip Ila which tends to guide the thread loop downwards over the bottomface of the bobbin container. This mechanism also includes an arm 28which is pivotally supported at its outer ,end on a bracket 29 attachedon the base I 0a. A pintle 30 is used for the pivotal supporting. Aspring 3| is coaxial on the pintle and acts between the bracket 29 andthe arm 28 for normally urging the arm upwards. A member 32 is mountedon the arm 28 -and extends under the cam I4a (see particularlyFig. 3) ina manner so as to pivot the arm downwards as the bobbin container turns.'I'he free end 28' of the arm 28 is adapted to engage into the loop ofthe top thread as it is formed by the needle and to move the loopdownwards (see Fig. 4) so as to help maintain the thread of the loop toextend along the cam strip I4a.

The cam strip Ila extends substantially onehalf of the circumference ofthe bobbin container and then the member 32 drops off the end of the camand is snapped upwards to its original position, indicated by the dotand dash lines 28a in Fig. 5. 'I'here is a small projection 33 on thebody of the bobbin container I I immediately above the end of the camI4a to prevent the loop thread from slipping back over the bobbincontainer. 'I'he loop thread is now more than half way around thecontainer and as the gear I2 turns and the loop is drawn upwards it willfinish its circling act.

'I'he machine base Illa is formed with openings in its top face whichare closed by conventional slides 34. It is also provided with a plate35 for the feeders 36. This plate has an opening 31 for the needle 38 ofthe sewing machine to engage through. The feeders 36 are operated in theusual manner and so is the needle.

In Fig. 6 a modied form of bobbin container is disclosed which comprisesa container 4I having a top cover 42 engaging into the top thereof. Thiscover has a central opening 43 through which the thread 44 from thebobbin 45 may pass. The container 4I is provided with the gear I2. Inother respects this bobbin container is identical to that previouslyshown and its position and operation are the same.

The operation of the device is as follows:-

When the needle 38 reaches its lowermost position and then starts totravel upwards, the top thread in the needle is slightly looped. Theloop catching hooks I3 and I4 catch this loop I 4 and drop a portion ofit'into the deep cut root I2a between a pair of the teeth of the gearI2. The bobbin container II is being turned by the drive which connectswith the pinion gear I5a. The flanges I5V have niches t5' which aresynchronized with the root I2a to permit the thread to pass the anges ofeach of the pinion gears as the bobbin container II turns. The lowerportion of the thread loop I4 guides along the cam I4a and the loop I4is also caught by the end of the arm 28 which moves it downwards at thesame rate as the pitch of the cam strip Ila so that the loop extendsalong the said cam strip I4a. 'Ihis cam strip guides the loop to thebottom of the bobbin container and so the loop extends completely aroundthe bobbin container and catches the bobbin thread. The arm 28 is moveddownwards by the member 32 engaging the cam Ida, and when the member 32is dropped the arm 28 will move back to its original position and beready for the next thread loop. This arm will be moved downwards againwhen the bobbin container II reaches its initial position, since thenthe finger 32 will again engage beneath a portion of the cam strip I4awhich will again move it downwards.

In Fig. 7 a simplified form of the invention has been disclosed. Thisform is a preferred one. Essentially, it consists of a bobbin containerII' of comparatively shallow. depth and formed with a passage II a forthe thread. Y An annular gear I2' is mounted around the container II andis substantially of the same width as the depth of the container- II'.The gear I2' has one root between a pair of adjacent gear teeth cutdeep, indicated by numeral I2a. This deep cut root I2a is synchronizedwith the cuts I5' on the flanges `I5 of the supporting gears whichsupport the gear I2 in the identical manner previously described. Thesesame parts are indicated in Fig. 7 by the same reference numerals usedin the prior disclosure.

Mounted on the gear I2 at the deep root cut location I2a there is a tophook I3. This hook is above a bottom hook I3a. This bottom hook I3a issubstantially at the same position as the bottom face of the containerII.

The container II is illustrated with a removable cover IIe and houses abobbin IIdd. In

other respects this form of the invention is identical to thepreviousform and the corresponding parts may be recognized by the samereference numerals, except for the fact that it lacks the cam strip Ida,the arm 28, and the other associated parts for guiding the thread aroundthe container. This form of the invention does not need the guidingmeans since it is of a narrow enough width for the thread to engagearound the container by itself.

The operation of this form of the device is as follows:-

The top thread which is carried down by the needle 38 forms a loop I 4'which is picked up simultaneously by the two hooks I3 and I3a. 'I'hen aportion of the loop falls into the root I2a. As the container II rotatesthe loop I4' will be drawn over theentire container II' and catch thethread o'f the bobbin.

While I have illustrated and described my invention with some degree ofparticularity, I realize that in practice various alterations thereinmay be made. I therefore reserve the right and privilege of changing theform of the details of construction or otherwise altering thearrangement ofthe correlated parts without departing from the spirit orthe scope of the appended claims.

Having thus described my invention, what I claim as new and desire tohave secured by United States Letters Patent is:-

1. In a sewing machine, a bobbin container with a passage for thethread, an annular gear around said container and having the rootbetween a pair of adjacent gear teeth cut deep, top thread loop catchinghooks mounted on said containe';- at the sides of said gear to guide theloop into said cut of said gear, rotatively supported pinion gearsmeshing with said gear and havingl flanges engaging the sides of saidgear and rotatively supporting same, said flanges having peripheral cutssynchronized to align with said cut in said gear to pass said threadloop during rotation of said gears.

2. In a sewing machine, a bobbin container with a'passage for thethread, anrannular gear laroundV said container and having the rootbetween a pair of adjacent gear teeth cut deep, top thread loop catchinghooks mounted on said container at the sides of said gear to guide theloop into said cut of said gear. rotatively supported pinion gearsmeshing with said gear and having flanges engaging the sides of saidgear and rotatively supporting same, said anges having peripheral cutssynchronized to align with said cut in said gear to pass said threadloopduring rotation of said gears, said container being much deeper than thedepth of said gear, a spiral cam along the side of said container andconnecting with one of said hooks for guiding the thread loop aroundsaid container.

3. In a sewing machine, a bobbin container with a passage for thethread, an annular gear around said container and having the rootbetween a pair of adjacent gear teeth cut deep, top thread loop catchinghooks mounted on said container at the sides of said gear to guide theloop into said cut of said gear, rotatively supported pinion gearsmeshing with said gear and having iianges engaging the sides of saidgear and rotatively supporting same, said flanges having peripheral cutssynchronized to align with said cut in said gearto pass said thread loopduring rotation k'of said gears, said container being much deeper thanthe depth of said gear, a spiral cam along the side oi' said containerand connecting with one of said hooks for guiding the thread loop aroundsaid container, and a follower resiliently supported and moved by saidcam and engageable with said thread loop for guiding the thread -loop ofsaid cam.

4. In a sewing machine, a bobbin container with a passage for thethread, an annular gear around said container and of a substantial widthin relation to the width of said container, rotatively supported piniongears meshing with l said gear and having anges engaging the sides ofsaid gear and rotatively supporting same, means for driving oneL of saidpinion gears, and top thread loop catching hooks superimposed and onopposite sides of said gear for catching the top thread looped by theneedle and guiding said loop between a pair of teeth of said gear andthen around said bobbin container.

l HENRY WEISSMANN.

